Smoke conversion device in sintering kiln

Abstract

The utility model discloses a flue gas conversion device in a sintering kiln, and particularly relates to the technical field of sintering kilns, the flue gas conversion device comprises a sintering kiln main body, two ends of the sintering kiln main body are respectively provided with a kiln tail and a kiln head, and exhaust ends of the kiln tail and the kiln head are connected with waste heat recovery pipes. By opening and closing the first switch valve and the second switch valve, switching of flue gas emission paths can be realized, flexible adjustment can be realized according to sintering conditions of materials in the kiln, adaptability of operation is improved, heat distribution in the kiln can be optimized, heat can act on the material sintering process more accurately, and the sintering efficiency of the materials is improved. For example, forward smoke discharge can fully preheat front-section materials in the kiln, reverse smoke discharge can ensure complete sintering of rear-section materials, through reasonable switching, heat waste is reduced, the overall heat efficiency is improved, heat in passing waste gas can be recycled through the arranged waste heat recycling pipe, and the using effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of sintering kiln technology, and more specifically, to a flue gas conversion device inside a sintering kiln. Background Technology

[0002] Kiln sintering is a traditional process that transforms powdered materials into a dense body. It involves heating powder or powder compacts in a kiln to a temperature below the melting point of their basic components, followed by cooling to room temperature using specific methods and rates. The result of sintering is the bonding between powder particles, increased strength of the sintered body, and the transformation of powder particle aggregates into crystalline aggregates, thereby obtaining products or materials with the desired physical and mechanical properties.

[0003] Existing sintering kilns are designed with only a single flue gas emission direction during the calcination process, generally emitting from a fixed end at the kiln head or tail. When processing materials that require high-temperature and long-term sintering, the fixed flue gas direction may lead to uneven heat distribution within the kiln, with some areas having excess heat and others insufficient heat. This not only wastes energy but may also result in unstable product quality. Furthermore, the exhaust gas is discharged directly, making it inconvenient to recover the residual heat from the flue gas. Therefore, a flue gas conversion device for sintering kilns is proposed. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a flue gas conversion device in a sintering kiln to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a flue gas conversion device in a sintering kiln, comprising a sintering kiln body, with a kiln tail and a kiln head respectively located at both ends of the sintering kiln body. Both the kiln tail and the kiln head are connected to exhaust ends with waste heat recovery pipes. The heat from the discharged flue gas can be recovered through these waste heat recovery pipes. A first waste gas pipe and a second waste gas pipe are respectively located at one end of each of the two waste heat recovery pipes. One end of the first and second waste gas pipes is connected to a main waste gas pipe via a T-junction. The first waste gas pipe is used to transport the flue gas discharged from the kiln head, and the second waste gas pipe is used to transport the flue gas discharged from the kiln tail. The main waste gas pipe then transports the flue gas from different pipes to subsequent treatment equipment (such as a desulfurization and denitrification device).

[0006] The first and second waste gas pipes are respectively equipped with a first switch valve and a second switch valve at the end near the main waste gas pipe. The switching between the first and second waste gas pipes can be controlled by the first and second switch valves. When the first switch valve is opened and the second switch valve is closed, only the flue gas from the kiln head is discharged through the main waste gas pipe. When the second switch valve is opened and the first switch valve is closed, only the flue gas from the kiln tail is discharged. This can be flexibly adjusted according to the sintering condition of the material in the kiln, improving the adaptability of operation.

[0007] The waste heat recovery pipe is symmetrically fixedly connected to mounting plates at both ends. A sealing gasket is embedded on one side of each mounting plate. A flow channel and a heat exchange chamber are located in the middle of the waste heat recovery pipe. Multiple heat-conducting rods are fixedly connected to the middle of the flow channel. A heat exchange pipe and a heat-conducting plate are fixedly connected to the middle of the heat exchange chamber. An inlet pipe and an outlet pipe are connected to both ends of the heat exchange pipe, respectively. The mounting plates facilitate easy assembly and connection, while the sealing gaskets improve the sealing of the connection, preventing flue gas leakage and the entry of cold air from the outside, thus avoiding heat loss and affecting subsequent processing. When high-temperature flue gas flows through the flow channel, heat is transferred to the heat-conducting plate through the heat-conducting rods, and further transferred to the heat exchange medium (such as cold water or heat transfer oil) inside the heat exchange pipe. This also improves heat exchange efficiency. The inlet pipe is located at the top of the heat exchange pipe and is used to introduce a low-temperature heat exchange medium; the outlet pipe is located at the bottom of the heat exchange pipe and is used to discharge the high-temperature heat exchange medium after absorbing heat. This top-bottom layout conforms to the principle of heat convection, ensuring that the heat exchange medium fully absorbs heat and improving the waste heat recovery effect.

[0008] Preferably, the first switch valve is located at the end of the first waste gas pipe near the main waste gas pipe, and the second switch valve is located at the end of the second waste gas pipe near the main waste gas pipe. By controlling the opening and closing of these two valves, the flue gas emission path can be switched and flexibly adjusted according to the sintering condition of the material in the kiln, thereby improving the adaptability of operation.

[0009] Preferably, the first waste gas pipe is connected to the exhaust end of the kiln head through the air passage in the middle of the waste heat recovery pipe, and the second waste gas pipe is connected to the exhaust end of the kiln tail through the waste heat recovery pipe, so that the waste gas can be discharged by entering the interior of the first waste gas pipe and the second waste gas pipe through the middle of the air passage.

[0010] Preferably, the first exhaust gas pipe and the kiln head are both connected to the mounting plates at both ends of the waste heat recovery pipe via flanges, and the second exhaust gas pipe and the kiln tail are both connected to the mounting plates at both ends of the waste heat recovery pipe via flanges, which facilitates the installation and fixing of the waste heat recovery pipe.

[0011] Preferably, a plurality of heat-conducting rods are arranged in a rotating array in the middle of the airflow channel. Both ends of the heat-conducting rods are fixedly connected to a heat-conducting plate. The heat-conducting plate is located in the middle of the heat exchange tube. The heat exchange tube is spirally arranged in the middle of the heat exchange cavity. The heat-conducting plate is in close contact with the heat exchange tube. The heat-conducting rods can improve the heat exchange efficiency. The close contact between the heat-conducting plate and the heat exchange tube increases the contact area, thereby further improving the heat exchange efficiency.

[0012] Preferably, the heat exchange tube is configured as a square structure, with the heat exchange tubes tightly fitted together. The liquid inlet pipe is located at the top of the heat exchange tube, and the liquid outlet pipe is located at the bottom of the heat exchange tube. The liquid inlet pipe is located at the top of the heat exchange tube and is used to introduce the low-temperature heat exchange medium. The liquid outlet pipe is located at the bottom of the heat exchange tube and is used to discharge the high-temperature heat exchange medium after absorbing heat. This top-bottom arrangement conforms to the principle of heat convection, ensuring that the heat exchange medium fully absorbs heat and improving the waste heat recovery effect.

[0013] The technical effects and advantages of this utility model are as follows:

[0014] 1. This utility model firstly achieves the switching of flue gas emission paths by opening and closing the first and second switching valves. It can be flexibly adjusted according to the sintering of materials in the kiln, improving the adaptability of operation and optimizing the heat distribution in the kiln, so that the heat can be applied more precisely to the sintering process of the materials. For example, forward flue gas can fully preheat the materials in the front section of the kiln, while reverse flue gas can ensure that the materials in the back section are completely sintered. Through reasonable switching, heat waste is reduced and the overall thermal efficiency is improved. Furthermore, the waste heat recovery pipe can recover the heat in the exhaust gas, improving the utilization effect.

[0015] 2. This utility model also facilitates the installation and fixing of the waste heat recovery pipe through the installation plate and sealing gasket. The heat-conducting rod improves heat exchange efficiency, and the heat-conducting plate, in close contact with the heat exchange pipe, increases the contact area, further enhancing heat exchange efficiency. The inlet pipe is located at the top of the heat exchange pipe for introducing the low-temperature heat exchange medium; the outlet pipe is located at the bottom of the heat exchange pipe for discharging the high-temperature heat exchange medium after heat absorption. This top-bottom layout conforms to the principle of heat convection, ensuring that the heat exchange medium fully absorbs heat and improving the waste heat recovery effect.

[0016] In summary, through the interaction of the above-mentioned multiple functions, the flue gas emission path can be switched, and it can be flexibly adjusted according to the sintering condition of the material in the kiln, improving the adaptability of operation, making the heat more accurately applied to the sintering process of the material, reducing heat waste, improving the overall thermal efficiency, and facilitating the recovery of heat from the exhaust gas. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2This is a schematic diagram of the waste heat recovery pipe of this utility model.

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of the waste heat recovery pipe of this utility model.

[0020] Figure 4 This is a top view of the waste heat recovery pipe of this utility model.

[0021] The attached diagram is labeled as follows: 1. Sintering kiln body; 2. Kiln tail; 3. Kiln head; 4. Waste heat recovery pipe; 5. First waste gas pipe; 6. Second waste gas pipe; 7. Main waste gas pipe; 8. First switch valve; 9. Second switch valve; 10. Mounting plate; 11. Sealing gasket; 12. Air passage; 13. Heat exchange chamber; 14. Heat-conducting rod; 15. Heat-conducting plate; 16. Heat exchange tube; 17. Liquid inlet pipe; 18. Liquid outlet pipe. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] As attached Figure 1-3 The sintering kiln flue gas conversion device shown includes a sintering kiln body 1. A kiln tail 2 and a kiln head 3 are respectively provided at both ends of the sintering kiln body 1. The exhaust ends of the kiln tail 2 and the kiln head 3 are connected to waste heat recovery pipes 4. The heat of the exhaust flue gas can be recovered through the waste heat recovery pipes 4. A first waste gas pipe 5 and a second waste gas pipe 6 are respectively provided at one end of the two waste heat recovery pipes 4. One end of the first waste gas pipe 5 and the second waste gas pipe 6 are connected to a waste gas main pipe 7 through a T-junction. The first waste gas pipe 5 is used to transport the flue gas discharged from the kiln head 3, the second waste gas pipe 6 is used to transport the flue gas discharged from the kiln tail 2, and the waste gas main pipe 7 transports the flue gas from different pipes to subsequent treatment equipment such as desulfurization and denitrification devices.

[0024] First exhaust gas pipe 5 and second exhaust gas pipe 6 are respectively equipped with first switch valve 8 and second switch valve 9 at the ends near the main exhaust gas pipe 7. The switching of first exhaust gas pipe 5 and second exhaust gas pipe 6 can be controlled by first switch valve 8 and second switch valve 9. When first switch valve 8 is opened and second switch valve 9 is closed, only the flue gas from kiln head 3 is discharged through the main exhaust gas pipe 7. When second switch valve 9 is opened and first switch valve 8 is closed, only the flue gas from kiln tail 2 is discharged. It can be flexibly adjusted according to the sintering of materials in the kiln, improving the adaptability of operation.

[0025] The waste heat recovery pipe 4 is symmetrically fixedly connected to both ends with mounting plates 10. A sealing gasket 11 is embedded on one side of the mounting plate 10. The waste heat recovery pipe 4 is provided with an air passage 12 and a heat exchange chamber 13 in the middle. Multiple heat-conducting rods 14 are fixedly connected to the middle of the air passage 12. A heat exchange pipe 16 and a heat-conducting plate 15 are fixedly connected to the middle of the heat exchange chamber 13. The two ends of the heat exchange pipe 16 are respectively connected to an inlet pipe 17 and an outlet pipe 18. The mounting plates 10 facilitate assembly and connection. The sealing gasket 11 improves the sealing of the connection and prevents flue gas leakage and the entry of cold air from the outside. To avoid heat loss and impact on subsequent processing, when the high-temperature flue gas flows through the air passage 12, the heat is transferred to the heat-conducting plate 15 through the heat-conducting rod 14, and the heat is further transferred to the heat exchange medium such as cold water or heat transfer oil in the heat exchange tube 16. At the same time, it can improve the heat exchange efficiency. The liquid inlet pipe 17 is located at the top of the heat exchange tube 16 and is used to introduce the low-temperature heat exchange medium; the liquid outlet pipe 18 is located at the bottom of the heat exchange tube 16 and is used to discharge the high-temperature heat exchange medium after absorbing heat. This top-bottom layout conforms to the principle of heat convection, ensuring that the heat exchange medium fully absorbs heat and improves the waste heat recovery effect.

[0026] As attached Figure 1-4 As shown, the first switch valve 8 is located at the end of the first waste gas pipe 5 near the main waste gas pipe 7, and the second switch valve 9 is located at the end of the second waste gas pipe 6 near the main waste gas pipe 7. The first waste gas pipe 5 is connected to the exhaust end of the kiln head 3 through the air passage 12 in the middle of the waste heat recovery pipe 4, and the second waste gas pipe 6 is connected to the exhaust end of the kiln tail 2 through the waste heat recovery pipe 4. The first waste gas pipe 5 and the kiln head 3 are both connected to the mounting plates 10 at both ends of the waste heat recovery pipe 4 through flanges, and the second waste gas pipe 6 and the kiln tail 2 are both connected to the mounting plates 10 at both ends of the waste heat recovery pipe 4 through flanges. By controlling the opening and closing of these two valves, the flue gas emission path can be switched and flexibly adjusted according to the sintering condition of the material in the kiln, improving the adaptability of operation, facilitating the discharge of waste gas through the middle of the air passage 12 into the interior of the first waste gas pipe 5 and the second waste gas pipe 6, and facilitating the installation and fixing of the waste heat recovery pipe 4.

[0027] As attached Figure 3 , 4As shown, multiple heat-conducting rods 14 are arranged in a rotating array in the middle of the airflow channel 12. Both ends of the heat-conducting rods 14 are fixedly connected to the heat-conducting plates 15. The heat-conducting plates 15 are located in the middle of the heat exchange tubes 16, which are spirally arranged in the middle of the heat exchange chamber 13. The heat-conducting plates 15 are in close contact with the heat exchange tubes 16, which are square in structure and tightly fitted together. The liquid inlet pipe 17 is located at the top of the heat exchange tubes 16, and the liquid outlet pipe 18 is located at the bottom of the heat exchange tubes 16. The heat-conducting rods 14 can improve the heat exchange efficiency. The heat-conducting plates 15 are in close contact with the heat exchange tubes 16, increasing the contact area and further improving the heat exchange efficiency. The liquid inlet pipe 17 is located at the top of the heat exchange tubes 16 and is used to introduce the low-temperature heat exchange medium. The liquid outlet pipe 18 is located at the bottom of the heat exchange tubes 16 and is used to discharge the high-temperature heat exchange medium after absorbing heat. This vertical arrangement conforms to the principle of heat convection, ensuring that the heat exchange medium fully absorbs heat and improving the waste heat recovery effect.

[0028] The working principle of this utility model is as follows: When in use, the first switch valve 8 is closed and the second switch valve 9 is opened. The waste gas inside the sintering kiln body 1 enters the waste heat recovery pipe 4 through the exhaust end of the kiln tail 2. Liquid is introduced into the liquid inlet pipe 17 and output through the liquid outlet pipe 18. When the waste gas passes through the middle of the air passage 12, it can exchange heat with the liquid inside the heat exchange pipe 16 through the heat-conducting rod 14 and heat-conducting plate 15, thereby realizing heat recovery. Then the waste gas is discharged through the waste gas main pipe 7.

[0029] When the first switch valve 8 is opened and the second switch valve 9 is closed, the waste gas inside the sintering kiln body 1 enters the waste heat recovery pipe 4 through the exhaust end of the kiln head 3, and then enters the waste gas main pipe 7 through the first waste gas pipe 5 for discharge. Heat is recovered when passing through the waste heat recovery pipe 4.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flue gas conversion device for a sintering kiln, comprising a sintering kiln body (1), characterized in that: The sintering kiln body (1) is provided with a kiln tail (2) and a kiln head (3) at both ends. The exhaust ends of the kiln tail (2) and the kiln head (3) are connected to waste heat recovery pipes (4). A first waste gas pipe (5) and a second waste gas pipe (6) are provided at one end of the two waste heat recovery pipes (4). One end of the first waste gas pipe (5) and the second waste gas pipe (6) are connected to a waste gas main pipe (7) through a three-way pipe. The first exhaust gas pipe (5) and the second exhaust gas pipe (6) are respectively provided with a first switch valve (8) and a second switch valve (9) at the end near the exhaust gas main pipe (7); The waste heat recovery pipe (4) is symmetrically fixedly connected to the two ends of the mounting plate (10). A sealing gasket (11) is embedded on one side of the mounting plate (10). The waste heat recovery pipe (4) is provided with a flow channel (12) and a heat exchange chamber (13) in the middle. Multiple heat-conducting rods (14) are fixedly connected to the middle of the flow channel (12). A heat exchange pipe (16) and a heat-conducting plate (15) are fixedly connected to the middle of the heat exchange chamber (13). The two ends of the heat exchange pipe (16) are respectively connected to an inlet pipe (17) and an outlet pipe (18).

2. The flue gas conversion device in a sintering kiln according to claim 1, characterized in that: The first switch valve (8) is located at one end of the first exhaust gas pipe (5) near the exhaust gas main pipe (7), and the second switch valve (9) is located at one end of the second exhaust gas pipe (6) near the exhaust gas main pipe (7).

3. The flue gas conversion device in a sintering kiln according to claim 1, characterized in that: The first waste gas pipe (5) is connected to the exhaust end of the kiln head (3) through the air passage (12) in the middle of the waste heat recovery pipe (4), and the second waste gas pipe (6) is connected to the exhaust end of the kiln tail (2) through the waste heat recovery pipe (4).

4. The flue gas conversion device in a sintering kiln according to claim 1, characterized in that: The first exhaust gas pipe (5) and the kiln head (3) are connected to the two end mounting plates (10) of the waste heat recovery pipe (4) through flanges. The second exhaust gas pipe (6) and the kiln tail (2) are connected to the two end mounting plates (10) of the waste heat recovery pipe (4) through flanges.

5. The flue gas conversion device in a sintering kiln according to claim 1, characterized in that: Multiple heat-conducting rods (14) are arranged in a rotating array in the middle of the airflow channel (12). Both ends of the heat-conducting rods (14) are fixedly connected to the heat-conducting plate (15). The heat-conducting plate (15) is located in the middle of the heat exchange tube (16). The heat exchange tube (16) is spirally arranged in the middle of the heat exchange cavity (13). The heat-conducting plate (15) is in close contact with the heat exchange tube (16).

6. The flue gas conversion device in a sintering kiln according to claim 1, characterized in that: The heat exchange tube (16) is configured as a square structure, the heat exchange tube (16) is tightly fitted, the liquid inlet pipe (17) is located at the top of the heat exchange tube (16), and the liquid outlet pipe (18) is located at the bottom of the heat exchange tube (16).

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